This 12 volt power adaptor is compabile with the MP3 Player, Rev C. It can also be used with the 8051 development board, however, the 9 volt power adaptor is recommended for use with that board.

The current rating is 800 mA, which is compatible with both of these project. This adaptor requires 120 volt AC voltage at 60 Hz, and it has a plug that is compatible with US and Canadian electrical outlets. It will not work in countries with 240 volt 50 Hz AC voltage.